diff --git a/packages/agent/karma.conf.cjs b/packages/agent/karma.conf.cjs
index aa89cbca8..6b7407b2c 100644
--- a/packages/agent/karma.conf.cjs
+++ b/packages/agent/karma.conf.cjs
@@ -30,14 +30,15 @@ module.exports = function (config) {
     // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
     frameworks: ['mocha'],
 
-    // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
     client: {
+      // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
       mocha: {
         timeout: 10000 // 10 seconds
-      }
+      },
+      // If an environment variable is defined, override the default test DWN URL.
+      testDwnUrl: process.env.TEST_DWN_URL,
     },
 
-
     // list of files / patterns to load in the browser
     files: [
       { pattern: 'tests/**/*.spec.ts', watched: false },
diff --git a/packages/agent/tests/dwn-manager.spec.ts b/packages/agent/tests/dwn-manager.spec.ts
index 8089b8b4c..e3e9b9fa6 100644
--- a/packages/agent/tests/dwn-manager.spec.ts
+++ b/packages/agent/tests/dwn-manager.spec.ts
@@ -12,6 +12,7 @@ import {
   RecordsDeleteMessage,
 } from '@tbd54566975/dwn-sdk-js';
 
+import { testDwnUrl } from './test-config.js';
 import { TestAgent } from './utils/test-agent.js';
 import { DwnManager } from '../src/dwn-manager.js';
 import { ManagedIdentity } from '../src/identity-manager.js';
@@ -26,8 +27,7 @@ if (!globalThis.crypto) globalThis.crypto = webcrypto;
 
 chai.use(chaiAsPromised);
 
-// let dwnNodes: string[] = ['https://dwn.tbddev.org/dwn0'];
-let dwnNodes: string[] = ['http://localhost:3000'];
+let testDwnUrls: string[] = [testDwnUrl];
 
 describe('DwnManager', () => {
 
@@ -279,7 +279,7 @@ describe('DwnManager', () => {
           type            : 'DecentralizedWebNode',
           serviceEndpoint : {
             encryptionKeys : ['#dwn-enc'],
-            nodes          : dwnNodes,
+            nodes          : testDwnUrls,
             signingKeys    : ['#dwn-sig']
           }
         }];
diff --git a/packages/agent/tests/test-config.ts b/packages/agent/tests/test-config.ts
new file mode 100644
index 000000000..213604404
--- /dev/null
+++ b/packages/agent/tests/test-config.ts
@@ -0,0 +1,24 @@
+declare const __karma__: { config?: { testDwnUrl?: string; } };
+
+const DEFAULT_TEST_DWN_URL = 'https://dwn.tbddev.org/dwn0';
+
+function getTestDwnUrl(): string {
+  // Check to see if we're running in a Karma browser test environment.
+  const browserTestEnvironment = typeof __karma__ !== 'undefined' && __karma__?.config?.testDwnUrl !== undefined;
+
+  // Check to see if we're running in a Node environment.
+  const nodeTestEnvironment = process && process?.env !== undefined;
+
+  // Attempt to use DWN URL defined in Karma config, if running a browser test.
+  // Otherwise, attempt to use the Node environment variable.
+  const envTestDwnUrl = (browserTestEnvironment)
+    ? __karma__.config!.testDwnUrl
+    : (nodeTestEnvironment)
+      ? process.env.TEST_DWN_URL
+      : undefined;
+
+  // If defined, return the test environment DWN URL. Otherwise, return the default.
+  return envTestDwnUrl || DEFAULT_TEST_DWN_URL;
+}
+
+export const testDwnUrl = getTestDwnUrl();
\ No newline at end of file
diff --git a/packages/api/karma.conf.cjs b/packages/api/karma.conf.cjs
index e114c588c..6b7407b2c 100644
--- a/packages/api/karma.conf.cjs
+++ b/packages/api/karma.conf.cjs
@@ -30,23 +30,23 @@ module.exports = function (config) {
     // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
     frameworks: ['mocha'],
 
-    // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
     client: {
+      // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
       mocha: {
         timeout: 10000 // 10 seconds
-      }
+      },
+      // If an environment variable is defined, override the default test DWN URL.
+      testDwnUrl: process.env.TEST_DWN_URL,
     },
 
     // list of files / patterns to load in the browser
     files: [
-      // { pattern: 'tests/test-user-agent.ts', watched: false },
       { pattern: 'tests/**/*.spec.ts', watched: false },
     ],
 
     // preprocess matching files before serving them to the browser
     // available preprocessors: https://www.npmjs.com/search?q=keywords:karma-preprocessor
     preprocessors: {
-      // 'tests/test-user-agent.ts' : ['esbuild'],
       'tests/**/*.spec.ts': ['esbuild'],
     },
 
@@ -68,7 +68,7 @@ module.exports = function (config) {
     // level of logging
     // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN ||
     // config.LOG_INFO || config.LOG_DEBUG
-    logLevel: config.INFO,
+    logLevel: config.LOG_INFO,
 
     concurrency: 1,
 
diff --git a/packages/api/tests/record.spec.ts b/packages/api/tests/record.spec.ts
index 5897baa12..c0303251c 100644
--- a/packages/api/tests/record.spec.ts
+++ b/packages/api/tests/record.spec.ts
@@ -12,6 +12,7 @@ import { ManagedIdentity, TestManagedAgent } from '@web5/agent';
 import { Record } from '../src/record.js';
 import { DwnApi } from '../src/dwn-api.js';
 import { dataToBlob } from '../src/utils.js';
+import { testDwnUrl } from './test-config.js';
 import { TestUserAgent } from './utils/test-user-agent.js';
 import { TestDataGenerator } from './utils/test-data-generator.js';
 
@@ -28,6 +29,8 @@ if (!globalThis.crypto) globalThis.crypto = webcrypto;
 // TODO: Come up with a better way of resolving the TS errors.
 type RecordsWriteTest = RecordsWrite & RecordsWriteMessage;
 
+let testDwnUrls: string[] = [testDwnUrl];
+
 describe('Record', () => {
   let dataText: string;
   let dataBlob: Blob;
diff --git a/packages/api/tests/test-config.ts b/packages/api/tests/test-config.ts
new file mode 100644
index 000000000..213604404
--- /dev/null
+++ b/packages/api/tests/test-config.ts
@@ -0,0 +1,24 @@
+declare const __karma__: { config?: { testDwnUrl?: string; } };
+
+const DEFAULT_TEST_DWN_URL = 'https://dwn.tbddev.org/dwn0';
+
+function getTestDwnUrl(): string {
+  // Check to see if we're running in a Karma browser test environment.
+  const browserTestEnvironment = typeof __karma__ !== 'undefined' && __karma__?.config?.testDwnUrl !== undefined;
+
+  // Check to see if we're running in a Node environment.
+  const nodeTestEnvironment = process && process?.env !== undefined;
+
+  // Attempt to use DWN URL defined in Karma config, if running a browser test.
+  // Otherwise, attempt to use the Node environment variable.
+  const envTestDwnUrl = (browserTestEnvironment)
+    ? __karma__.config!.testDwnUrl
+    : (nodeTestEnvironment)
+      ? process.env.TEST_DWN_URL
+      : undefined;
+
+  // If defined, return the test environment DWN URL. Otherwise, return the default.
+  return envTestDwnUrl || DEFAULT_TEST_DWN_URL;
+}
+
+export const testDwnUrl = getTestDwnUrl();
\ No newline at end of file
diff --git a/packages/api/tests/web5-dwn.spec.ts b/packages/api/tests/web5-dwn.spec.ts
index 36be516ac..e90d5dcd7 100644
--- a/packages/api/tests/web5-dwn.spec.ts
+++ b/packages/api/tests/web5-dwn.spec.ts
@@ -2,11 +2,11 @@ import { expect } from 'chai';
 import { TestManagedAgent } from '@web5/agent';
 
 import { DwnApi } from '../src/dwn-api.js';
+import { testDwnUrl } from './test-config.js';
 import { TestUserAgent } from './utils/test-user-agent.js';
 import emailProtocolDefinition from './fixtures/protocol-definitions/email.json' assert { type: 'json' };
 
-// let dwnNodes: string[] = ['https://dwn.tbddev.org/dwn0'];
-let dwnNodes: string[] = ['http://localhost:3000'];
+let testDwnUrls: string[] = [testDwnUrl];
 
 describe('web5.dwn', () => {
   let dwn: DwnApi;
@@ -30,7 +30,7 @@ describe('web5.dwn', () => {
       type            : 'DecentralizedWebNode',
       serviceEndpoint : {
         encryptionKeys : ['#dwn-enc'],
-        nodes          : dwnNodes,
+        nodes          : testDwnUrls,
         signingKeys    : ['#dwn-sig']
       }
     }];
diff --git a/packages/common/karma.conf.cjs b/packages/common/karma.conf.cjs
index aa89cbca8..6b7407b2c 100644
--- a/packages/common/karma.conf.cjs
+++ b/packages/common/karma.conf.cjs
@@ -30,14 +30,15 @@ module.exports = function (config) {
     // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
     frameworks: ['mocha'],
 
-    // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
     client: {
+      // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
       mocha: {
         timeout: 10000 // 10 seconds
-      }
+      },
+      // If an environment variable is defined, override the default test DWN URL.
+      testDwnUrl: process.env.TEST_DWN_URL,
     },
 
-
     // list of files / patterns to load in the browser
     files: [
       { pattern: 'tests/**/*.spec.ts', watched: false },
diff --git a/packages/credentials/karma.conf.cjs b/packages/credentials/karma.conf.cjs
index aa89cbca8..6b7407b2c 100644
--- a/packages/credentials/karma.conf.cjs
+++ b/packages/credentials/karma.conf.cjs
@@ -30,14 +30,15 @@ module.exports = function (config) {
     // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
     frameworks: ['mocha'],
 
-    // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
     client: {
+      // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
       mocha: {
         timeout: 10000 // 10 seconds
-      }
+      },
+      // If an environment variable is defined, override the default test DWN URL.
+      testDwnUrl: process.env.TEST_DWN_URL,
     },
 
-
     // list of files / patterns to load in the browser
     files: [
       { pattern: 'tests/**/*.spec.ts', watched: false },
diff --git a/packages/crypto/karma.conf.cjs b/packages/crypto/karma.conf.cjs
index 083f0c963..6b7407b2c 100644
--- a/packages/crypto/karma.conf.cjs
+++ b/packages/crypto/karma.conf.cjs
@@ -30,11 +30,13 @@ module.exports = function (config) {
     // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
     frameworks: ['mocha'],
 
-    // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
     client: {
+      // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
       mocha: {
         timeout: 10000 // 10 seconds
-      }
+      },
+      // If an environment variable is defined, override the default test DWN URL.
+      testDwnUrl: process.env.TEST_DWN_URL,
     },
 
     // list of files / patterns to load in the browser
diff --git a/packages/dids/karma.conf.cjs b/packages/dids/karma.conf.cjs
index 083f0c963..6b7407b2c 100644
--- a/packages/dids/karma.conf.cjs
+++ b/packages/dids/karma.conf.cjs
@@ -30,11 +30,13 @@ module.exports = function (config) {
     // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
     frameworks: ['mocha'],
 
-    // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
     client: {
+      // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
       mocha: {
         timeout: 10000 // 10 seconds
-      }
+      },
+      // If an environment variable is defined, override the default test DWN URL.
+      testDwnUrl: process.env.TEST_DWN_URL,
     },
 
     // list of files / patterns to load in the browser
diff --git a/packages/identity-agent/karma.conf.cjs b/packages/identity-agent/karma.conf.cjs
index aa89cbca8..6b7407b2c 100644
--- a/packages/identity-agent/karma.conf.cjs
+++ b/packages/identity-agent/karma.conf.cjs
@@ -30,14 +30,15 @@ module.exports = function (config) {
     // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
     frameworks: ['mocha'],
 
-    // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
     client: {
+      // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
       mocha: {
         timeout: 10000 // 10 seconds
-      }
+      },
+      // If an environment variable is defined, override the default test DWN URL.
+      testDwnUrl: process.env.TEST_DWN_URL,
     },
 
-
     // list of files / patterns to load in the browser
     files: [
       { pattern: 'tests/**/*.spec.ts', watched: false },
diff --git a/packages/proxy-agent/karma.conf.cjs b/packages/proxy-agent/karma.conf.cjs
index aa89cbca8..6b7407b2c 100644
--- a/packages/proxy-agent/karma.conf.cjs
+++ b/packages/proxy-agent/karma.conf.cjs
@@ -30,14 +30,15 @@ module.exports = function (config) {
     // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
     frameworks: ['mocha'],
 
-    // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
     client: {
+      // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
       mocha: {
         timeout: 10000 // 10 seconds
-      }
+      },
+      // If an environment variable is defined, override the default test DWN URL.
+      testDwnUrl: process.env.TEST_DWN_URL,
     },
 
-
     // list of files / patterns to load in the browser
     files: [
       { pattern: 'tests/**/*.spec.ts', watched: false },
diff --git a/packages/user-agent/karma.conf.cjs b/packages/user-agent/karma.conf.cjs
index aa89cbca8..6b7407b2c 100644
--- a/packages/user-agent/karma.conf.cjs
+++ b/packages/user-agent/karma.conf.cjs
@@ -30,14 +30,15 @@ module.exports = function (config) {
     // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
     frameworks: ['mocha'],
 
-    // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
     client: {
+      // Increase Mocha's default timeout of 2 seconds to prevent timeouts during GitHub CI runs.
       mocha: {
         timeout: 10000 // 10 seconds
-      }
+      },
+      // If an environment variable is defined, override the default test DWN URL.
+      testDwnUrl: process.env.TEST_DWN_URL,
     },
 
-
     // list of files / patterns to load in the browser
     files: [
       { pattern: 'tests/**/*.spec.ts', watched: false },